Wind generating set and main bearing cooling device thereof

Abstract

The invention provides a wind generating set and a main bearing cooling device thereof.The wind generating set comprises a mounting bin, a main bearing body, a cooling liquid conveying pipeline, a cooling liquid backflow pipeline, a cooling liquid circulating pump and a cooling liquid radiator, a rotating shaft is rotationally mounted in the mounting bin, and rotating fan blades are fixedly mounted at one end of the rotating shaft; the main bearing body is used for supporting a rotating shaft of the generator set, a generator body is fixedly installed at one end of the rotating shaft, and one end of the cooling liquid conveying pipeline is connected with a cooling liquid storage box. The cooling liquid circulation system is arranged to be matched with the main bearing, efficient heat exchange is achieved through closed circulation of cooling liquid, the temperature of the main bearing is remarkably reduced, and the operation reliability of the generator set is improved; by intelligently regulating and controlling the flow of the cooling liquid and monitoring the liquid level in real time, insufficient or excessive cooling liquid is avoided, and safe and stable operation of the system is ensured.

Description

Technical Field

[0001] This invention relates to the field of generator cooling technology, and in particular to a wind turbine generator and its main bearing cooling device, belonging to the field of mechanical engineering cooling technology. Background Technology

[0002] When wind turbine generators generate electricity, it is essential to maintain a constant output frequency. This is crucial for both grid-connected wind turbines and wind-solar hybrid power generation. One way to ensure a constant frequency is to maintain a constant generator speed, i.e., constant speed and constant frequency operation. Since the generator is driven by the wind turbine through a transmission system, this method undoubtedly requires a constant wind turbine speed, which can affect the wind energy conversion efficiency. Another method is to allow the generator speed to vary with wind speed, using other means to maintain a constant output frequency, i.e., variable speed constant frequency operation. In the existing technology, the main bearing of the generator set is prone to overheating when it is running at high speed, which leads to increased bearing wear, reduced efficiency, and even equipment failure. Traditional cooling methods have low heat dissipation efficiency and cannot meet the continuous operation requirements of high-power generator sets. To address this, a wind turbine generator set and its main bearing cooling device are proposed. Summary of the Invention

[0003] In view of this, the present invention provides a wind turbine generator set and its main bearing cooling device to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0004] The technical solution of this invention is implemented as follows: a wind turbine generator set and its main bearing cooling device, comprising: an installation chamber, a main bearing body, a coolant delivery pipe, a coolant return pipe, a coolant circulation pump, and a coolant radiator. A rotating shaft is rotatably installed inside the installation chamber, with a rotating fan blade fixedly installed at one end of the shaft. The main bearing body supports the generator set's rotating shaft, and the generator body is fixedly installed at one end of the shaft. One end of the coolant delivery pipe is connected to a coolant storage tank, and the other end is connected to the main bearing body for supplying coolant to the main bearing. One end of the coolant return pipe is connected to the main bearing body, and the other end is connected to the coolant storage tank for returning the coolant from the main bearing to the storage tank. The coolant circulation pump is installed on the coolant delivery pipe to drive the coolant to circulate between the delivery pipe and the return pipe. The coolant radiator is installed on the coolant return pipe to reduce the temperature of the coolant.

[0005] More preferably, the main bearing body is provided with a coolant inlet and a coolant outlet, a coolant delivery pipe is connected to the coolant inlet, and a coolant return pipe is connected to the coolant outlet.

[0006] More preferably, both the coolant delivery pipe and the coolant return pipe are equipped with flow control valves to regulate the flow rate of the coolant.

[0007] More preferably, the coolant storage tank is equipped with a level sensor for real-time monitoring of the coolant level.

[0008] More preferably, the coolant circulation pump is a variable frequency pump, which can automatically adjust its speed according to the temperature of the coolant.

[0009] A wind turbine generator set includes a main bearing cooling device as described above.

[0010] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: I. This invention, through the cooperation between the coolant circulation system and the main bearing, achieves efficient heat exchange via a closed-loop circulating coolant, significantly reducing the temperature of the main bearing and improving the operational reliability of the generator set.

[0011] Second, this invention, through the cooperation between a flow control valve and a liquid level sensor, intelligently regulates the coolant flow rate and monitors the liquid level in real time, thereby avoiding insufficient or excessive coolant and ensuring the safe and stable operation of the system.

[0012] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a perspective view of the external structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the internal structure of the installation compartment of the present invention; Figure 3 This is a three-dimensional structural diagram of the rotating shaft and generator body of the present invention. Figure 4 This is a three-dimensional structural diagram of the coolant radiator and flow control valve of the present invention.

[0015] Reference numerals: 1. Installation compartment; 101. Coolant inlet; 102. Coolant outlet; 103. Main bearing body; 104. Rotating fan blade; 2. Shaft; 201. Generator body; 3. Coolant storage tank; 4. Coolant delivery pipeline; 5. Coolant return pipeline; 6. Coolant circulation pump; 7. Coolant radiator; 8. Flow control valve; 9. Liquid level sensor. Detailed Implementation

[0016] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] like Figures 1-4 As shown, this embodiment of the invention provides a wind turbine generator set and its main bearing cooling device, including: a mounting chamber 1, a main bearing body 103, a coolant delivery pipe 4, a coolant return pipe 5, a coolant circulation pump 6, and a coolant radiator 7. A rotating shaft 2 is rotatably mounted inside the mounting chamber 1, and a rotating fan blade 104 is fixedly mounted at one end of the rotating shaft 2. The main bearing body 103 is used to support the rotating shaft 2 of the generator set, and a generator body 201 is fixedly mounted at one end of the rotating shaft 2. One end of the coolant delivery pipe 4 is connected to a coolant storage tank 3, and the other end of the coolant delivery pipe 4 is connected to the main bearing body 103 for delivering coolant to the main bearing. One end of the coolant return pipe 5 is connected to the main bearing body 103, and the other end of the coolant return pipe 5 is connected to the coolant storage tank 3 for returning the coolant in the main bearing to the storage tank. The coolant circulation pump 6 is installed on the coolant delivery pipe 4 for driving the coolant to circulate between the delivery pipe and the return pipe. The coolant radiator 7 is installed on the coolant return pipe 5 for reducing the temperature of the coolant.

[0019] The coolant is driven by the coolant circulation pump 6 from the coolant storage tank 3 through the coolant delivery pipe 4 into the main bearing body 103. After absorbing the heat of the bearing, the coolant flows through the coolant return pipe 5 to the coolant radiator 7 for cooling, and finally returns to the coolant storage tank 3, forming a continuous cycle.

[0020] Reference Figure 2 The main bearing body 103 is provided with a coolant inlet 101 and a coolant outlet 102. The coolant delivery pipe 4 is connected to the coolant inlet 101, and the coolant return pipe 5 is connected to the coolant outlet 102. Both the coolant delivery pipe 4 and the coolant return pipe 5 are provided with flow control valves 8 to regulate the flow rate of the coolant.

[0021] The flow rate can be dynamically adjusted according to the bearing temperature by using flow control valve 8 to optimize cooling efficiency.

[0022] Reference Figure 2 The coolant storage tank 3 is equipped with a level sensor 9 for real-time monitoring of the coolant level. The coolant circulation pump 6 is a variable frequency pump that can automatically adjust its speed according to the coolant temperature.

[0023] The coordinated operation of the liquid level sensor 9 and the variable frequency pump enables automated control, preventing coolant shortage or pump overload.

[0024] In operation, this invention works as follows: coolant is pumped from the coolant storage tank 3 by the coolant circulation pump 6 and injected into the coolant inlet 101 of the main bearing body 103 via the coolant delivery pipe 4. The coolant absorbs the heat generated by the rotation of the shaft 2 within the bearing's internal flow channels. After absorbing heat, the coolant exits through the outlet 102 into the coolant return pipe 5, where it is cooled by forced air cooling as it flows through the coolant radiator 7. Finally, it returns to the storage tank to complete the circulation. Throughout the process, the flow control valve 8 on the pipe adjusts the flow rate according to the bearing temperature, the liquid level sensor 9 monitors the liquid storage status in real time, and the coolant circulation pump 6 automatically adjusts its speed based on the temperature signal, forming a highly efficient collaborative mechanism of heat exchange, heat dissipation, and feedback control. This system, through a combination of physical heat conduction and intelligent control, ensures that the main bearing remains within its optimal temperature range while also optimizing energy efficiency and protecting the equipment through variable flow design and delayed shutdown function.

[0025] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A cooling device for the main bearing of a wind turbine generator set, characterized in that: The assembly includes an installation chamber (1), a main bearing body (103), a coolant delivery pipe (4), a coolant return pipe (5), a coolant circulation pump (6), and a coolant radiator (7). A rotating shaft (2) is rotatably mounted inside the installation chamber (1). A rotating fan blade (104) is fixedly mounted at one end of the rotating shaft (2). The main bearing body (103) supports the generator set's rotating shaft (2). A generator body (201) is fixedly mounted at one end of the rotating shaft (2). One end of the coolant delivery pipe (4) is connected to a coolant storage tank (3). The other end of the delivery pipe (4) is connected to the main bearing body (103) for delivering coolant to the main bearing. One end of the coolant return pipe (5) is connected to the main bearing body (103), and the other end of the coolant return pipe (5) is connected to the coolant storage tank (3) for returning the coolant in the main bearing to the storage tank. The coolant circulation pump (6) is installed on the coolant delivery pipe (4) for driving the coolant to circulate between the delivery pipe and the return pipe. The coolant radiator (7) is installed on the coolant return pipe (5) for reducing the temperature of the coolant.

2. The main bearing cooling device for a wind turbine generator set according to claim 1, characterized in that: The main bearing body (103) is provided with a coolant inlet (101) and a coolant outlet (102). The coolant delivery pipe (4) is connected to the coolant inlet (101), and the coolant return pipe (5) is connected to the coolant outlet (102).

3. The main bearing cooling device for a wind turbine generator set according to claim 1, characterized in that: Both the coolant delivery pipe (4) and the coolant return pipe (5) are equipped with flow control valves (8) for adjusting the flow rate of the coolant.

4. The main bearing cooling device for a wind turbine generator set according to claim 1, characterized in that: The coolant storage tank (3) is equipped with a level sensor (9) for real-time monitoring of the coolant level.

5. A cooling device for the main bearing of a wind turbine generator set according to claim 1, characterized in that: The coolant circulation pump (6) is a variable frequency pump, which can automatically adjust the speed according to the temperature of the coolant.

6. A wind turbine generator set, characterized in that: Includes the main bearing cooling device as described in any one of claims 1 to 5.

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